a=[12,'dwadwa',None,'ooo',45,1313,22]

print("获取李表中第5个元素:",a[5])
for b in a:
    print(b)
a[3]='study'
print(a)
print("查询元素所在列表中个位置:")
a.index(22)
print("想列表中后才入一个元素：")
a.insert(2,"oook")
print(a)
print("向列表中追加一个元素：")
a.append("shi")
print(a)
b=["ert",124,None]
print("将b组元素添加到a列表中:")
a.extend(b)
print(a)
print("查找12在列表中出现的次数：",a.count(12))
a.remove(45)
print(a)
a.pop(2)
print(a)
a.sort()
print(a)